Moments trip gently along over here. Snow caps the bushes in unexpected ways, birds shoot and spin like balls of sound. My feet hum over the dry walks. A storm smoothes the sky, impounding the city lights, returning to us a dull yellow glow. I run every other day at the small indoor track [at Columbia] which slants slightly upward like a plate; I stretch long and slow, twist and shake, the fatigue, the inertia finding home in different parts of the body. I check the time and growl—aargh!—and tumble onto the wheel. And bodies crowd and give off heat, some people are in front and you can hear the patter or plod of the steps behind. You look down to watch your feet, neat unified steps, and you throw back your arms and run after people, and run from them and with them, and sometimes someone will shadow your pace, step for step, and you can hear the person puffing, a different puff than yours, and on a good day they’ll come up alongside and thank you for a good run, for keeping a good pace, and you nod and keep going on your way, but you’re pretty pleased, and your stride gets lighter, the slumber slipping off behind you, into the wake of the past.
Gag! He wrote like Edgar Allen Poe, minus the swinging pendulum.
If that doesn't tell you something, this journal entry from a separate girlfriend does (from 1983):
Thursday, January 26
How is he so old already, at the age of 22? I have to recognize (despite play of wry and mocking smile on lips) that I find his thereness very threatening…. Distance, distance, distance, and wariness.
There's a lot more of this stuff in the new Vanity Fair piece "Becoming Obama."